JDBC connection database (MySQL) steps

First, the first step is to mysql Built in database a surface

CREATE TABLE a(
    `id` INT PRIMARY KEY,
    `NAME` VARCHAR(40),
    `PASSWORD` VARCHAR(40),
    `email` VARCHAR(60),
    `birthday` DATE
);

The second step is idea Introduction in mysql-connector-java.jar package , Download address of the package ：MySQL :: Download Connector/Jhttps://dev.mysql.com/downloads/connector/j/?os=26 The way to import packages is ： First, unzip the downloaded package , find mysql-connector-java.jar package , And copy the package to the project

lib Under the directory of ,lib The directory needs to be created by yourself

Then right-click lib Catalog , Click on Add as Library The import is really successful

  Then start connecting to the database in the project

public class JdbcFirstDemo {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        //1、 The load driver ( Fixed writing )
        Class.forName("com.mysql.jdbc.Driver");

        //2、 User information 、URL( Fixed writing )
        String url="jdbc:mysql://localhost:3306/a?useUnicode=true&useCharacter=utf8&useSSL=true";
        String user="root";// user name 
        String pwd = "123456";/ User password 

        //3、 Successful connection , Database objects ( Fixed writing )
        Connection connection = DriverManager.getConnection(url, user, pwd);

        //4、 perform sql The object of ( Fixed writing )
        Statement statement = connection.createStatement();

        //5、 perform sql sentence , Return result set 
        String sql="select * from a";//sql Query statement 
        ResultSet resultSet = statement.executeQuery(sql);
        while (resultSet.next()){
            System.out.println("id="+resultSet.getObject("id"));
            System.out.println("name="+resultSet.getObject("NAME"));
            System.out.println("password="+resultSet.getObject("PASSWORD"));
            System.out.println("email="+resultSet.getObject("email"));
            System.out.println("birth="+resultSet.getObject("birthday"));
        }// Output results 

        // Release the connection ( Fixed writing )
        resultSet.close();
        statement.close();
        connection.close();
    }
}

  Step summary :

        1、 The load driver
        2、 Connect to database DriverManager
        3、 Get executed sql The object of Statement
        4、 Get the returned result set
        5、 Release the connection